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.\" SPDX-License-Identifier: BSD-2-Clause
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.\" Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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.Dd March 29, 2025
.Dt SCREEN.LUA 8
.Os
.Sh NAME
.Nm screen.lua
.Nd bootloader screen manipulation module
.Sh DESCRIPTION
.Nm
contains functionality for manipulating the screen.
This includes functionality such as clearing the screen, moving the cursor, and
setting foreground/background colors using sequences provided by
.Xr color.lua 8 .
.Pp
Before using the functionality provided by
.Nm ,
it must be included with a statement such as the following:
.Pp
.Dl local screen = require("screen")
.Pp
The following variables are exported from
.Nm :
.Bl -tag -width "Ic screen.default_x" -offset indent
.It Ic screen.default_x
The x component of the default cursor position.
.It Ic screen.default_y
The y component of the default cursor position.
.El
.Pp
The following functions are exported from
.Nm :
.Bl -tag -width "Fn screen.clear" -offset indent
.It Fn screen.clear
Clears the screen.
.Fn screen.clear
will do nothing if a serial boot is detected.
.It Fn screen.setcursor x y
Sets the cursor position to
.Fa x ,
.Fa y .
.Fn screen.setcursor
will do nothing if a serial boot is detected.
.It Fn screen.setforeground color_value
Sets the foreground color to
.Fa color_value ,
which should be a constant defined in
.Xr color.lua 8 .
.Fn screen.setforeground
will do nothing if color is disabled.
.It Fn screen.setbackground color_value
Sets the background color to
.Fa color_value ,
which should be a constant defined in
.Xr color.lua 8 .
.Fn screen.setbackground
will do nothing if color is disabled.
.It Fn screen.defcolor
Sets the default color scheme, as defined by
.Fn color.default .
.Fn screen.defcolor
will do nothing if color is disabled.
.It Fn screen.defcursor
Sets the default cursor position to that defined by
.Ic screen.default_x ,
.Ic screen.default_y .
.El
.Sh SEE ALSO
.Xr color.lua 8
.Sh AUTHORS
The
.Nm
file was originally written by
.An Pedro Souza Aq Mt pedrosouza@FreeBSD.org .
Later work and this manual page was done by
.An Kyle Evans Aq Mt kevans@FreeBSD.org .
